You are suffering from secondary infertility
and now presents with delayed period for more than 10 days of due date. You also get positive pregnancy
It is safe to conceive and there is no relation with previous abortion,occurred 5 yrs ago. Do following things like Continue folic acid
supplements, protein rich diet, avoid long journey/heavy work, maintain personal hygiene, take adequate rest and do a USG scan after 4wks for detailed feto-placental well being. Do periodic check up and suggestive investigations.
Be well and wish you for successful mother.